CN112197171B - Intelligent remote voltage regulation control system - Google Patents
Intelligent remote voltage regulation control system Download PDFInfo
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- CN112197171B CN112197171B CN202011261039.0A CN202011261039A CN112197171B CN 112197171 B CN112197171 B CN 112197171B CN 202011261039 A CN202011261039 A CN 202011261039A CN 112197171 B CN112197171 B CN 112197171B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses an intelligent remote pressure regulating control system, and relates to the technical field of natural gas transmission and distribution control systems. The intelligent voltage regulation system comprises a PLC control cabinet, a control terminal cabinet and field equipment, wherein the PLC control cabinet outputs a control command to the control terminal cabinet based on intelligent voltage regulation control logic according to parameters acquired by the field equipment, so that the purpose of automatic voltage regulation is achieved; the control terminal cabinet provides the gas storage tank with control equipment and parameters such as gas storage pressure buffering, gas storage pressure feedback, gas storage boosting electromagnetic valve, gas storage pressure reduction electromagnetic valve, boosting flow control valve, pressure reduction flow control valve and the like for the pressure regulating system. The intelligent remote pressure regulating control system provided by the invention is stable in operation, utilizes the gas storage tank to provide gas storage pressure buffering, is favorable for pressure regulating control, and is more stable.
Description
Technical Field
The invention relates to the technical field of natural gas transmission and distribution control systems, in particular to an intelligent remote pressure regulating control system.
Background
The modern city natural gas transmission and distribution system is a complex energy comprehensive facility and consists of transmission and distribution pipe networks with different pressure levels, various natural gas stations (door stations, pressure regulating stations, gas filling stations and the like) and software and hardware systems for information acquisition, management and maintenance and the like.
The pressure regulating metering station can be divided into the following parts according to the scale size and functional characteristics: skid-mounted urban door stations, regional pressure regulating cabinets, direct-fired pressure regulating boxes and building pressure regulating boxes. The system has the functions of automatic balance, ultrahigh and low pressure cut-off, overpressure relief, double-circuit pressure regulation switching, remote monitoring and the like. And has the advantages of wide pressure regulating range, high pressure stabilizing precision, accurate measurement, beautiful and elegant box body, etc. The method is widely applied to gas transmission and distribution, residential buildings in residential areas, gas boilers, industrial furnaces, various combustion terminals and the like. The existing pressure regulating control system cannot be remotely controlled and is inconvenient to implement maintenance in the future, and the existing pressure regulating control system directly obtains control parameters from a gas transmission and distribution pipeline, and the gas pressure of the existing pressure regulating control system is not buffered, so that the pressure regulating control is not facilitated.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides an intelligent remote pressure regulating control system, and aims to solve the problems that remote control cannot be performed, gas pressure cannot be buffered, and pressure regulating control is not facilitated in the prior art. The intelligent remote voltage regulation control system comprises a PLC control cabinet, a control terminal cabinet and field equipment, wherein the PLC control cabinet outputs a control command to the control terminal cabinet based on intelligent voltage regulation control logic according to parameters acquired by the field equipment to achieve the purpose of automatic voltage regulation; the control terminal cabinet provides the gas storage tank with control equipment and parameters such as gas storage pressure buffering, gas storage pressure feedback, gas storage boosting electromagnetic valve, gas storage pressure reduction electromagnetic valve, boosting flow control valve, pressure reduction flow control valve and the like for the pressure regulating system. The intelligent remote pressure regulating control system provided by the invention is stable in operation, utilizes the gas storage tank to provide gas storage pressure buffering, is favorable for pressure regulating control, and is more stable.
In order to overcome the problems in the prior art, the invention is realized by the following technical scheme:
intelligent remote voltage regulation control system, its characterized in that: the PLC control cabinet, at least one control terminal cabinet and at least one field device are included, and the field devices correspond to the control terminal cabinets one by one; the field device comprises a stop valve, a pressure regulator and a flowmeter which are arranged on a gas transmission and distribution pipeline; the control terminal cabinet comprises an air storage tank, an air storage inlet pipe, an air storage boosting electromagnetic valve, an air storage pressure reducing electromagnetic valve, a boosting flow control valve, a pressure regulating air pipe, a pressure reducing flow control valve and a pressure releasing and diffusing pipe; the gas storage tank is connected with the inlet end of a gas transmission and distribution pipeline of the field equipment through a gas storage inlet pipe and a gas storage boosting electromagnetic valve, the inlet pressure of the gas transmission and distribution pipeline is introduced into the gas storage tank, and the gas storage tank is communicated with the pressure relief and release pipe through a gas storage pressure reduction electromagnetic valve; the air storage tank is connected with a director on a pressure regulator of the field equipment through a pressure boosting flow control valve and a pressure regulating air pipe; the pressure regulating air pipe is provided with a branch air pipe which is communicated with the discharge pipe, and the branch air pipe is provided with a pressure reducing flow control valve; the PLC control cabinet respectively collects the inlet pressure and the outlet pressure on a fuel gas transmission and distribution pipeline in the field equipment; the PLC control cabinet is in communication connection with a cut-off valve and a flowmeter in the field device; the PLC acquires the gas storage pressure in the gas storage tank and establishes communication connection with a gas storage boosting electromagnetic valve, a gas storage depressurizing electromagnetic valve, a boosting flow control valve and a depressurizing flow control valve in the control terminal cabinet respectively;
when the gas storage pressure entering the gas storage tank is higher than the upper limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure-increasing solenoid valve to be closed, gas of a gas source is prevented from entering the gas storage tank through the gas storage gas inlet pipe and the gas storage pressure-increasing solenoid valve, meanwhile, the PLC control cabinet controls the gas storage pressure-reducing solenoid valve to be opened, and the gas in the gas storage tank is discharged through the pressure-releasing and diffusing pipe, so that the gas storage pressure is reduced; when the gas storage pressure entering the gas storage tank is greater than the upper limit of the gas storage pressure set in the PLC control cabinet, the control cabinet controls the gas storage pressure boosting electromagnetic valve to be closed, and gas of a gas source is prevented from entering the gas storage tank through the gas storage inlet pipe; when the gas storage pressure entering the gas storage tank is lower than the lower limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure reduction solenoid valve to be closed to prevent the gas in the gas storage tank from being discharged through the pressure relief and release pipe, and simultaneously the PLC control cabinet controls the gas storage pressure increase solenoid valve to be opened to enable the gas source gas to enter the gas storage tank through the gas storage inlet pipe, so that the gas storage pressure in the gas storage tank is increased;
when the outlet pressure of the outlet end of the gas transmission and distribution pipeline of the field equipment is smaller than the lower limit of the outlet pressure set in the PLC control cabinet, the PLC control cabinet automatically calculates and provides a boosting quantity (4-20 MA current) to the boosting flow control valve according to the ratio of the outlet pressure to the set pressure, controls the opening degree of the boosting flow control valve, and closes the pressure reduction flow control valve at the same time, so that the gas in the gas storage tank enters a director of the pressure regulator through the boosting flow control valve and the pressure regulating gas pipe according to the specified flow, thereby increasing the outlet pressure of the outlet end of the gas transmission and distribution pipeline;
when the outlet pressure of the outlet end of the gas transmission and distribution pipeline of the field equipment is greater than the upper limit of the set outlet pressure in the PLC control cabinet, the PLC control cabinet automatically calculates and provides a depressurization amount (4-20 MA current) to the depressurization flow control valve according to the ratio of the outlet pressure to the set pressure so as to control the opening degree of the depressurization flow control valve, and simultaneously closes the pressurization flow control valve, so that the gas in the commander passes through the depressurization flow control valve and the leakage diffusion pipe according to the specified flow to be discharged, the pressure in the pressure regulator is reduced, and the outlet pressure of the outlet end of the gas transmission and distribution pipeline where the pressure regulator is located is reduced.
An inlet pressure transmitter is arranged at the inlet end of a fuel gas transmission and distribution pipeline in the field equipment, measures the inlet pressure at the inlet end of the fuel gas transmission and distribution pipeline, and transmits the measured inlet pressure to a PLC control cabinet; an outlet pressure transmitter is installed at an outlet section of the gas transmission and distribution pipeline and used for measuring outlet pressure at the outlet end of the gas transmission and distribution pipeline and transmitting the measured outlet pressure to the PLC control cabinet.
And the gas storage pressure transmitter is used for measuring the gas storage pressure in the gas storage tank and transmitting the measured gas storage pressure to the PLC control cabinet.
The PLC control cabinet comprises a PLC controller and input and output equipment, and the input and output equipment is connected with the PLC controller.
The input and output device is a touch screen.
And a manual adjusting spring is arranged on the director of the pressure regulator.
The PLC controller in the PLC control cabinet stores and operates the voltage regulation control logic, and the touch screen is used for adjusting control parameters in the voltage regulation control logic. The gas source enters the gas storage tank from the inlet end of the gas transmission and distribution pipeline through the gas storage inlet pipe and the gas storage boosting electromagnetic valve. The PLC control cabinet acquires the gas storage pressure of the gas storage tank in real time, when the gas storage pressure is ultrahigh, the PLC control cabinet controls the gas storage pressure reducing electromagnetic valve to be opened, and the gas in the gas storage tank is discharged through the gas storage pressure reducing electromagnetic valve and the pressure relief diffusing pipe; when the pressure of the outlet of the fuel gas transmission and distribution pipeline is ultralow, the gas in the gas storage tank enters a director of a pressure regulator through a pressure-boosting flow control valve and a pressure-regulating gas pipe so as to increase the pressure of the outlet of the fuel gas transmission and distribution pipeline; if the pressure of the outlet of the gas transmission and distribution pipeline is ultrahigh, the gas in the pressure regulator director is discharged through the pressure regulating gas pipe, the pressure reducing flow control valve and the pressure releasing and diffusing pipe, so that the pressure of the outlet of the gas transmission and distribution pipeline is reduced, and the stability of the gas storage pressure and the outlet pressure is kept.
The control principle of the invention is as follows: comprises the control of the pressure of the gas storage tank and the control of the output pressure of a pressure regulator. When the gas storage pressure entering the gas storage tank is higher than the upper limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure-increasing solenoid valve to be closed, gas of a gas source is prevented from entering the gas storage tank through the gas storage inlet pipe and the gas storage pressure-increasing solenoid valve, meanwhile, the PLC control cabinet controls the gas storage pressure-reducing solenoid valve to be opened, and the gas in the gas storage tank is discharged through the pressure-releasing and releasing pipe, so that the gas storage pressure is reduced; when the gas storage pressure entering the gas storage tank is lower than the upper limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure reduction solenoid valve to be closed, the gas in the gas storage tank is prevented from being discharged, and a certain amount of gas in the gas storage tank is maintained; when the gas storage pressure entering the gas storage tank is higher than the upper limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure boosting electromagnetic valve to be closed, and gas source gas is prevented from entering the gas storage tank through the gas storage inlet pipe and the gas storage pressure boosting electromagnetic valve; when the gas storage pressure entering the gas storage tank is lower than the lower limit of the gas storage pressure set in the PLC control cabinet, the PLC control cabinet controls the gas storage pressure boosting solenoid valve to be opened, so that gas of a gas source enters the gas storage tank through the gas storage inlet pipe, and the gas storage pressure in the gas storage tank is raised.
When the outlet pressure at the outlet end of the fuel gas distribution pipeline of the field equipment is smaller than the lower limit of the outlet pressure precision set in the PLC control cabinet, the PLC control cabinet automatically calculates and provides a boosting amount (4-20 MA current) to the boosting flow control valve according to the ratio of the outlet pressure to the set pressure, controls the opening degree of the boosting flow control valve, and closes the decompression flow control valve at the same time, so that the gas in the gas storage tank enters a director of the pressure regulator through the boosting flow control valve and the pressure regulating gas pipe according to the specified flow, and the outlet pressure at the outlet end of the fuel gas distribution pipeline is increased.
When the outlet pressure at the outlet end of the gas transmission and distribution pipeline of the field equipment is higher than the upper limit of the outlet pressure precision set in the PLC control cabinet, the PLC control cabinet automatically calculates and provides a depressurization amount (4-20 MA current) to the depressurization flow control valve according to the ratio of the outlet pressure to the set pressure, and closes the pressurization flow control valve at the same time, so that the gas in the director of the pressure regulator is discharged through the depressurization flow control valve and the leakage diffusion pipe according to the specified flow, the pressure of the director in the pressure regulator is reduced, and the outlet pressure at the outlet end of the gas transmission and distribution pipeline where the pressure regulator is located is reduced.
The output pressure of the pressure regulator can be ensured through the two steps, the upper and lower limit precision of the set pressure is maintained, and the purpose of automatic pressure regulation is further achieved.
The setting and checking of each parameter in the PLC controller in the PLC control cabinet specifically comprises the following steps: for the stable operation of the system and the prevention of manual misoperation, the PLC controller is formally adopted after important input parameters are examined and checked. For example:
"set pressure": when the pressure is modified, the upper and lower limit precision pressures of the set pressure are automatically calculated according to the set pressure regulating precision, and if the upper limit precision pressure is greater than the set maximum pressure, the modification is abandoned; if the lower accuracy pressure is less than the set minimum pressure, the modification is abandoned. The modified value is received only if the first two values are satisfied.
"pressure regulating precision": when modified, if this value is between 0 and 1, then it is received, otherwise it is discarded.
"maximum pressure": when modifying, if the current upper limit precision pressure is less than the current upper limit precision pressure, the modification is abandoned, otherwise, the modified value is received.
"minimum pressure": when modifying, if the lower precision pressure is larger than the current lower precision pressure, the modification is abandoned, otherwise, the modified value is received.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the remote voltage regulation control system consists of a PLC control cabinet, a control terminal cabinet and field devices, wherein the PLC control cabinet can be adapted to a plurality of field devices and a plurality of control terminal cabinets, and one control terminal cabinet corresponds to one field device; therefore, remote multi-site voltage regulation control can be realized, and when the PLC control cabinet is used, corresponding field equipment and a control terminal cabinet can be numbered in the PLC control cabinet, and parameters are set according to the numbers; the invention realizes the remote pressure regulating control of natural gas transmission and distribution, has stable control system, and can realize automatic pressure regulating control after parameter setting is finished.
2. Compared with the prior art that the control is directly carried out on a gas transmission pipeline, the pressure of the gas inlet of the gas storage tank is buffered through the gas storage tank, so that the pressure regulation control is more accurate. In the prior art, the gas of a director in a pressure regulator is directly connected with the inlet end of a fuel gas transmission and distribution pipeline, namely the pressure is directly obtained from the inlet end, when the pressure at the inlet end is slightly changed, the pressure can be reflected on the pressure regulator, and a PLC control cabinet cannot smoothly intervene in the mode, so that the large-range pressure regulation cannot be realized, namely the pressure regulation range is smaller.
3. The pressure regulator used in the invention is a self-operated pressure regulator, and a director of the pressure regulator keeps a manual regulating spring, for example, the director used in the invention patent with the patent number of 200910263525.3 owned by the applicant can set the minimum pressure according to the requirement, and can ensure that the whole pressure regulating system can still maintain the minimum working pressure when the PLC control cabinet fails.
4. In the invention, the PLC control cabinet outputs a control command to the control terminal cabinet based on intelligent pressure regulation control logic according to parameters (pressure, flow and the like) collected by field equipment, thereby achieving the purpose of automatic pressure regulation; providing a standard MODBUS TCP/MODBUS RTU communication interface, receiving control parameters of an external system, and feeding back the working state of the external system; the self-contained control interface can locally provide control parameters and independently operate and control.
5. In the invention, the control terminal cabinet provides the gas storage tank for providing gas storage pressure buffering, gas storage pressure feedback, gas storage boosting electromagnetic valve, gas storage depressurization electromagnetic valve, boosting flow control valve, depressurization flow control valve and other control equipment and parameters for the system. And executing the instructions of the PLC control cabinet to control the gas storage pressure and the outlet pressure. A field device: such as a pressure regulator, a flowmeter, a shut-off valve, a pressure transmitter and the like. The pressure regulator receives the pressure output by the control terminal cabinet through the commander and adjusts the outlet pressure of the pressure regulator; and the manual regulating spring is kept in the commander, the minimum pressure can be set as required, and the whole pressure regulating system can still maintain the minimum working pressure when the PLC cabinet fails.
Drawings
Fig. 1 is a schematic structural diagram of a remote voltage regulation control system according to the present invention.
Reference numerals: 100. the PLC control cabinet, 200, a control terminal cabinet, 300, field equipment, 1, a gas storage air inlet pipe, 2, a gas storage pressure-increasing solenoid valve, 3, a gas storage tank, 4, a gas storage pressure-reducing solenoid valve, 5, a pressure-reducing diffusing pipe, 6, a pressure-increasing flow control valve, 7, a pressure-regulating air pipe, 8, a pressure regulator, 9, a pressure-reducing flow control valve, 10, a gas storage pressure transmitter, 11, an outlet pressure transmitter, 12, an inlet pressure transmitter, 13, a cut-off valve, 14, a gas transmission and distribution pipeline, 15, a branch air pipe, 16 and a touch screen.
Detailed Description
The technical scheme of the invention is further elaborated in the following by combining the drawings in the specification.
Referring to the attached drawing 1 of the specification, this embodiment discloses an intelligent remote voltage regulation control system, which is composed of three parts, namely a PLC control cabinet 100, a control terminal cabinet 200 and field devices 300, wherein the control terminal cabinet 200 and the field devices 300 are correspondingly grouped one by one, and one PLC control cabinet 100 can be equipped with multiple groups of control terminal cabinets 200 and field devices 300. The PLC control cabinet 100 outputs a control command to the control terminal cabinet 200 based on the intelligent voltage regulation control logic according to the parameters collected by the field device 300, so as to achieve the purpose of automatic voltage regulation.
The intelligent remote voltage regulation control system comprises a PLC control cabinet 100, at least one control terminal cabinet 200 and at least one field device 300, wherein the field devices 300 correspond to the control terminal cabinets 200 one by one; the field device 300 comprises a shut-off valve 13, a pressure regulator 8 and a flowmeter which are arranged on a gas transmission and distribution pipeline 14, and the PLC control cabinet 100 is used for respectively acquiring inlet pressure and outlet pressure on the gas transmission and distribution pipeline 14 in the field device 300; the PLC control cabinet 100 is in communication connection with a shut-off valve 13 and a flowmeter in the field device 300; the control terminal cabinet 200 comprises an air storage tank 3, an air storage and inlet pipe 1, an air storage and pressure rise electromagnetic valve 2, an air storage and pressure reduction electromagnetic valve 4, a pressure rise flow control valve 6, a pressure regulation air pipe 7, a pressure reduction flow control valve 9 and a pressure release and release pipe 5; the gas storage tank 3 is connected with the inlet end of a gas transmission and distribution pipeline 14 of the field device 300 through a gas storage inlet pipe 1 and a gas storage boosting electromagnetic valve 2, the inlet pressure of the gas transmission and distribution pipeline 14 is introduced into the gas storage tank 3, and the gas storage tank 3 is communicated with a pressure relief and release pipe 5 through a gas storage pressure reduction electromagnetic valve 4; the gas storage tank 3 is connected with a director on a pressure regulator 8 of the field device 300 through a pressure boosting flow control valve 6 and a pressure regulating gas pipe 7; the pressure regulating air pipe 7 is provided with a branch air pipe 15 for communicating with the discharge pipe, and the branch air pipe 15 is provided with a pressure reducing flow control valve 9; the PLC acquires the gas storage pressure in the gas storage tank 3 and establishes communication connection with the gas storage pressure-increasing electromagnetic valve 2, the gas storage pressure-decreasing electromagnetic valve 4, the pressure-increasing flow control valve 6 and the pressure-decreasing flow control valve 9 in the control terminal cabinet 200 respectively.
The PLC controller in the PLC control cabinet 100 stores and runs the voltage regulation control logic, and the touch screen 16 is used to adjust the control parameters in the voltage regulation control logic. In this embodiment, the air source passage is: the gas source enters the gas storage tank 3 from the inlet end of the gas transmission and distribution pipeline 14 through the gas storage inlet pipe 1 and the gas storage boosting electromagnetic valve 2. The gas in the gas storage tank 3 is connected with a director of a pressure regulator 8 through a pressure boosting flow control valve 6 and a pressure regulating gas pipe 7, so that the outlet pressure of a gas transmission and distribution pipeline is controlled. In this embodiment, the PLC control cabinet 100 first controls the gas storage pressure in the gas storage tank 3, and then uses the gas storage pressure as the power of the commander in the pressure regulator 8 to realize the outlet pressure regulation at the outlet of the pressure regulator 8.
The PLC control cabinet 100 collects the gas storage pressure of the gas storage tank 3 in real time, when the gas storage pressure exceeds the upper limit of the gas storage pressure, the PLC control cabinet 100 controls the gas storage pressure reducing electromagnetic valve 4 to be opened, and the gas in the gas storage tank 3 is discharged through the gas storage pressure reducing electromagnetic valve 4 and the pressure relief diffusing pipe 5; when the gas storage pressure is lower than the upper limit of the gas storage pressure, the PLC control cabinet 100 controls the gas storage pressure reduction electromagnetic valve 4 to be closed; when the gas storage pressure exceeds the upper limit of the gas storage pressure, the PLC control cabinet 100 controls the gas storage pressure boosting electromagnetic valve 2 to be closed; when the gas storage pressure is lower than the lower limit of the gas storage pressure, the PLC control cabinet 100 controls the gas storage boosting electromagnetic valve 2 to be opened, and gas in the gas transmission and distribution pipeline 14 enters the gas storage tank 3 through the gas storage inlet pipe 1 and the gas storage boosting electromagnetic valve 2, so that the pressure in the gas storage tank is increased; if the outlet pressure of the fuel gas transmission and distribution pipeline is ultralow, the PLC control cabinet 100 controls the boosting flow control valve 6 in the gas storage tank 3 to be opened, and gas in the gas storage tank enters a director of the pressure regulator 8 through the boosting flow control valve 6 and the pressure regulating gas pipe 7, so that the outlet pressure of the fuel gas transmission and distribution pipeline 14 is increased; if the outlet pressure of the gas transmission and distribution pipeline is ultrahigh, the gas in the director of the pressure regulator 8 is discharged through the pressure regulating gas pipe 7, the pressure reducing flow control valve 9 and the pressure releasing and diffusing pipe 5, so that the gas storage pressure and the outlet pressure are kept stable.
The control principle (i.e. voltage regulation control logic) of this embodiment is as follows: comprises the pressure control of the air storage tank 3 and the output pressure control of the pressure regulator 8. When the gas storage pressure entering the gas storage tank 3 is greater than the upper limit of the gas storage pressure set in the PLC control cabinet 100, the PLC control cabinet 100 controls the gas storage pressure-increasing electromagnetic valve 2 to be closed, gas of a gas source is prevented from entering the gas storage tank 3 through the gas storage inlet pipe 1 and the gas storage pressure-increasing electromagnetic valve 2, meanwhile, the PLC control cabinet 100 controls the gas storage pressure-reducing electromagnetic valve 4 to be opened, and the gas in the gas storage tank 3 is discharged through the pressure-releasing and diffusing pipe 5, so that the gas storage pressure is reduced; when the gas storage pressure entering the gas storage tank 3 is lower than the upper limit of the gas storage pressure set in the PLC control cabinet 100, the PLC control cabinet 100 controls the gas storage pressure reduction electromagnetic valve 4 to be closed to prevent the gas storage pressure from continuously decreasing; when the gas storage pressure entering the gas storage tank 3 is higher than the upper limit of the gas storage pressure set in the PLC control cabinet 100, the PLC control cabinet 100 controls the gas storage pressure boosting electromagnetic valve 2 to be closed, and gas in the gas transmission and distribution pipeline is prevented from entering the gas storage tank 3; when the gas storage pressure of the gas storage tank 3 is lower than the lower limit of the gas storage pressure set in the PLC control cabinet 100, the gas in the gas storage tank 3 is discharged through the pressure relief and release pipe 5; the PLC control cabinet 100 controls the gas storage boosting electromagnetic valve 2 to be opened, so that gas in a gas source enters the gas storage tank 3 through the gas storage inlet pipe 1, and the gas storage pressure in the gas storage tank 3 is boosted.
When the outlet pressure at the outlet end of the gas transmission and distribution pipeline of the field device 300 is lower than the accuracy lower limit of the outlet pressure set in the PLC control cabinet 100, the PLC control cabinet 100 automatically calculates and provides a boost amount (4-20 MA current) to the boost flow control valve 6 according to the ratio of the outlet pressure to the set pressure, controls the opening degree of the boost flow control valve 6, and simultaneously closes the depressurization flow control valve 9, so that the gas in the gas storage tank 3 enters the director of the pressure regulator 8 through the boost flow control valve 6 and the pressure regulating gas pipe 7 according to the specified flow, thereby increasing the outlet pressure at the outlet end of the gas transmission and distribution pipeline.
When the outlet pressure at the outlet end of the gas transmission and distribution pipeline of the field device 300 is higher than the upper limit of the accuracy of the set outlet pressure in the PLC control cabinet 100, the PLC control cabinet 100 automatically calculates the step-down amount (4-20 MA current) to the step-down flow control valve 9 according to the ratio of the outlet pressure to the set pressure, and simultaneously closes the step-up flow control valve 6, so that the gas in the pressure regulator 8 is discharged through the step-down flow control valve 9 and the leakage diffusion pipe according to the specified flow, and the pressure in the pressure regulator 8 is reduced, thereby reducing the outlet pressure at the outlet end of the gas transmission and distribution pipeline where the pressure regulator 8 is located.
The output pressure of the pressure regulator 8 can be ensured through the two steps, the upper and lower limit precision of the set pressure is maintained, and the purpose of automatic pressure regulation is further achieved.
In this embodiment, the system can automatically operate according to the preset pressure regulation control logic only by presetting parameters such as an upper gas storage pressure limit, a lower gas storage pressure limit, an upper outlet pressure limit, a lower outlet pressure limit, an upper inlet pressure limit, a lower inlet pressure limit, and the set pressure of the gas transmission and distribution pipeline 14 in the PLC control cabinet 100.
In this embodiment, the setting and checking of each parameter in the PLC controller in the PLC control cabinet 100 specifically includes: for the stable operation of the system and the prevention of manual misoperation, the PLC controller formally adopts important input parameters after the important input parameters are checked and verified. For example: "set pressure": when the pressure is modified, the upper limit precision pressure and the lower limit precision pressure of the set pressure are automatically calculated according to the set pressure regulating precision, and if the upper limit precision pressure is greater than the set maximum pressure, the modification is abandoned; if the lower accuracy pressure is less than the set minimum pressure, the modification is abandoned. The modified value is received only if the first two values are satisfied. "pressure regulating precision": when modified, if this value is between 0 and 1, then it is received, otherwise it is discarded. "maximum pressure": when modifying, if the current upper limit precision pressure is smaller than the current upper limit precision pressure, the modification is abandoned, otherwise, the modified value is received. "minimum pressure": when modifying, if the lower precision pressure is larger than the current lower precision pressure, the modification is abandoned, otherwise, the modified value is received.
Further, an inlet pressure transmitter 12 is installed at an inlet end of the gas transmission and distribution pipeline 14 in the field device 300, and the inlet pressure transmitter 12 measures an inlet pressure at the inlet end of the gas transmission and distribution pipeline 14 and transmits the measured inlet pressure to the PLC control cabinet 100; an outlet pressure transmitter 11 is installed at an outlet section of the gas transmission and distribution pipeline 14, and the outlet pressure transmitter 11 measures the outlet pressure at the outlet end of the gas transmission and distribution pipeline 14 and transmits the measured outlet pressure to the PLC control cabinet 100. The gas storage tank 3 is provided with a gas storage pressure transmitter 10 for measuring the gas storage pressure in the gas storage tank 3, and the gas storage pressure transmitter 10 transmits the measured gas storage pressure to the PLC control cabinet 100.
The PLC control cabinet 100 outputs a control command to the control terminal cabinet 200 based on intelligent voltage regulation control logic according to parameters (pressure, flow and the like) collected by the field device 300, so as to achieve the purpose of automatic voltage regulation; providing a standard MODBUS TCP/MODBUS RTU communication interface, receiving control parameters of an external system, and feeding back the working state of the external system; the control interface is arranged, control parameters can be locally provided, and independent operation control is realized.
The PLC control cabinet 100 includes a PLC controller and an input/output device, and the input/output device is connected to the PLC controller. The input and output device is a touch screen 16. And a manual adjusting spring is arranged on the director of the pressure regulator 8. And the manual regulating spring is reserved in the commander, the minimum pressure can be set as required, and the minimum working pressure can still be maintained in the whole pressure regulating system when the PLC cabinet fails.
Claims (7)
1. Long-range pressure regulating control system of intelligence, its characterized in that: the PLC control cabinet comprises a PLC control cabinet (100), at least one control terminal cabinet (200) and at least one field device (300), wherein the field devices (300) correspond to the control terminal cabinets (200) one by one; the field device (300) comprises a shut-off valve (13), a pressure regulator (8) and a flowmeter which are arranged on a gas transmission and distribution pipeline (14), and the PLC control cabinet (100) respectively collects inlet pressure and outlet pressure on the gas transmission and distribution pipeline (14) in the field device (300); the PLC control cabinet (100) is in communication connection with a cut-off valve (13) and a flowmeter in the field device (300); the control terminal cabinet (200) comprises a gas storage tank (3), a gas storage inlet pipe (1), a gas storage boosting electromagnetic valve (2), a gas storage pressure reducing electromagnetic valve (4), a boosting flow control valve (6), a pressure regulating gas pipe (7), a pressure reducing flow control valve (9) and a pressure relief diffusing pipe (5); the gas storage tank (3) is connected with the inlet end of a gas transmission and distribution pipeline (14) of the field device (300) through a gas storage and inlet pipe (1) and a gas storage and pressure rise electromagnetic valve (2), the inlet pressure of the gas transmission and distribution pipeline (14) is introduced into the gas storage tank (3), and the gas storage tank (3) is communicated with a pressure release and release pipe (5) through a gas storage and pressure reduction electromagnetic valve (4); the gas storage tank (3) is connected with a director on a pressure regulator (8) of the field device (300) through a pressure boosting flow control valve (6) and a pressure regulating gas pipe (7); the pressure regulating air pipe (7) is provided with a branch air pipe (15) for communicating with the discharge pipe, and the branch air pipe (15) is provided with a pressure reducing flow control valve (9); the PLC acquires the gas storage pressure in the gas storage tank (3) and establishes communication connection with a gas storage pressure-increasing electromagnetic valve (2), a gas storage pressure-reducing electromagnetic valve (4), a pressure-increasing flow control valve (6) and a pressure-reducing flow control valve (9) in the control terminal cabinet (200) respectively;
when the gas storage pressure entering the gas storage tank (3) is higher than the upper limit of the gas storage pressure set in the PLC control cabinet (100), the PLC control cabinet (100) controls the gas storage pressure-boosting electromagnetic valve (2) to be closed, gas of a gas source is prevented from entering the gas storage tank (3) through the gas storage inlet pipe (1) and the gas storage pressure-boosting electromagnetic valve (2), meanwhile, the PLC control cabinet (100) controls the gas storage pressure-reducing electromagnetic valve (4) to be opened, and the gas in the gas storage tank (3) is discharged through the pressure-releasing and releasing pipe (5), so that the gas storage pressure is reduced; when the gas storage pressure entering the gas storage tank (3) is lower than the upper limit of the gas storage pressure set in the PLC control cabinet (100), the PLC control cabinet (100) controls the gas storage pressure reduction electromagnetic valve (4) to be closed; when the gas storage pressure entering the gas storage tank (3) is higher than the upper limit of the gas storage pressure set in the PLC control cabinet (100), the PLC control cabinet (100) controls the gas storage pressure boosting electromagnetic valve (2) to be closed; when the gas storage pressure entering the gas storage tank (3) is lower than the lower limit of the gas storage pressure set in the PLC control cabinet (100), the PLC control cabinet (100) controls the gas storage boosting electromagnetic valve (2) to be opened, so that gas of a gas source enters the gas storage tank (3) through the gas storage inlet pipe (1), and the gas storage pressure in the gas storage tank (3) is boosted;
when the outlet pressure of the outlet end of the fuel gas distribution pipeline of the field equipment is smaller than the lower limit of the outlet pressure set in the PLC control cabinet (100), the PLC control cabinet (100) automatically calculates and provides the boosting quantity to the boosting flow control valve (6) according to the ratio of the outlet pressure to the set pressure, controls the opening degree of the boosting flow control valve (6), and closes the pressure reduction flow control valve (9) at the same time, so that the gas in the gas storage tank (3) enters a director of the pressure regulator (8) through the boosting flow control valve (6) and the pressure regulating gas pipe (7) according to the specified flow, and the outlet pressure of the outlet end of the fuel gas distribution pipeline is increased;
when the outlet pressure of the outlet end of the fuel gas distribution pipeline of the field equipment is greater than the upper limit of the set outlet pressure in the PLC control cabinet (100), the PLC control cabinet (100) automatically calculates the pressure reduction amount to the pressure reduction flow control valve (9) according to the ratio of the outlet pressure to the set pressure so as to control the opening degree of the pressure reduction flow control valve (9), and simultaneously closes the pressure boosting flow control valve (6), so that the gas in the director passes through the pressure reduction flow control valve (9) and the leakage diffusing pipe according to the specified flow to be discharged, the pressure in the director of the pressure regulator (8) is reduced, and the outlet pressure of the outlet end of the fuel gas distribution pipeline where the pressure regulator (8) is located is reduced.
2. The intelligent remote voltage regulation control system of claim 1 wherein: an inlet pressure transmitter (12) is installed at the inlet end of a fuel gas transmission and distribution pipeline (14) in the field device (300), the inlet pressure transmitter (12) measures the inlet pressure of the inlet end of the fuel gas transmission and distribution pipeline (14) and transmits the measured inlet pressure to the PLC control cabinet (100); an outlet pressure transmitter (11) is installed at an outlet section of the gas transmission and distribution pipeline (14), the outlet pressure transmitter (11) measures outlet pressure at the outlet end of the gas transmission and distribution pipeline (14), and transmits the measured outlet pressure to the PLC control cabinet (100).
3. The intelligent remote voltage regulation control system of claim 1 or 2 wherein: and a gas storage pressure transmitter (10) for measuring the gas storage pressure in the gas storage tank (3) is arranged on the gas storage tank (3), and the gas storage pressure transmitter (10) transmits the measured gas storage pressure to the PLC control cabinet (100).
4. The intelligent remote voltage regulation control system of claim 1 wherein: the PLC control cabinet (100) comprises a PLC controller and input and output equipment, and the input and output equipment is connected with the PLC controller.
5. The intelligent remote voltage regulation control system of claim 4 wherein: the input and output device is a touch screen (16).
6. The intelligent remote voltage regulation control system of claim 1 wherein: and a manual adjusting spring is arranged on the director of the pressure regulator (8).
7. The intelligent remote voltage regulation control system of claim 1 wherein: the setting and the calibration of each parameter in the PLC controller in the PLC control cabinet are specifically as follows: modification of set pressure parameters: when the pressure is modified, the upper limit precision pressure and the lower limit precision pressure of the set pressure are automatically calculated according to the set pressure regulating precision, and if the upper limit precision pressure is greater than the set maximum pressure, the modification is abandoned; if the lower limit precision pressure is smaller than the set minimum pressure, abandoning modification; if the first two values are satisfied, receiving the modified value; modification of voltage regulation precision parameters: when modifying, if the value is between 0 and 1, receiving, otherwise giving up; modification of the maximum pressure parameter: when the pressure is modified, if the pressure is smaller than the current upper limit precision pressure, the modification is abandoned, otherwise, the modified value is received; modification of the minimum pressure parameter: when modifying, if the lower precision pressure is larger than the current lower precision pressure, the modification is abandoned, otherwise, the modified value is received.
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| CN202011261039.0A CN112197171B (en) | 2020-11-12 | 2020-11-12 | Intelligent remote voltage regulation control system |
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| CN113531398B (en) * | 2021-06-25 | 2022-06-03 | 河北永良燃气设备有限公司 | Pneumatic type remote pressure regulating control system |
| CN114442549A (en) * | 2021-12-27 | 2022-05-06 | 盐城市大丰燃气设备有限公司 | Urban natural air valve station control system |
| CN115235707A (en) * | 2022-06-27 | 2022-10-25 | 陕汽淮南专用汽车有限公司 | Controllable jar body air tightness test pressure test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3343415B2 (en) * | 1993-09-29 | 2002-11-11 | 東京瓦斯株式会社 | Distributed control system |
| CN102109055B (en) * | 2009-12-25 | 2012-07-04 | 特瑞斯信力(常州)燃气设备有限公司 | Remote pressure and flow control system of self-operated regulator |
| CN103336512B (en) * | 2013-06-29 | 2015-12-02 | 上海飞奥燃气设备有限公司 | Gas transmission and distribution intelligent management apapratus |
| CN205479618U (en) * | 2016-01-19 | 2016-08-17 | 河北长良工业自动化设备有限公司 | Pneumatic remote regulating system of voltage regulating station |
| CN107795850A (en) * | 2017-11-24 | 2018-03-13 | 乐山川天燃气输配设备有限公司 | Remote controlled pressure regulator |
| CN208123906U (en) * | 2018-05-04 | 2018-11-20 | 江苏科信燃气设备有限公司 | Gas pressure regulator, governor pressure regulating system |
| CN108547997B (en) * | 2018-06-29 | 2019-10-11 | 上海飞奥燃气设备有限公司 | A kind of long-range pressure regulation gas pressure regulator, governor and its long-range pressure regulation method |
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